Arduino dogaduje się z Processing

Ponieważ efektywna komunikacja to podstawa w życiu, postanowiłem sprawić, by Arduino dogadało się ze środowiskiem Processing. Od razu wiadomo było, że oba środowiska są podobne więc nie spodziewałem się kłopotów. I słusznie.
Skorzystałem tu ze świetnie napisanego artykułu: Connecting Arduino to Processing ze strony SparkFun.

ARDUINO ⇒ PROCESSING

Oto kod dla Arduino, banalnie prosty:

void setup() 
{
//initialize serial communications at a 9600 baud rate
Serial.begin(9600);

}

void loop()
{
//send 'Hello, world!' over the serial port
Serial.println("Tu Arduino!");
//wait 100 milliseconds so we don't drive ourselves crazy
delay(100);
}

A to kod dla Processing:

import processing.serial.*;

Serial myPort;  // Create object from Serial class
String val;     // Data received from the serial port


void setup()
{

  String portName = Serial.list()[1]; //ustawiamy numer portu 1,2....
  myPort = new Serial(this, portName, 9600);

fill(50);
text(portName, 10, 10, 70, 80);  // Wyświetla numer portu

}

void draw()
{
  if ( myPort.available() > 0) // If data is available,
  {  
  val = myPort.readStringUntil('\n');         // read it and store it in val
  }

println(val); //print it out in the console
}

Jedyna rzecz o której trzeba pamiętać w przypadku Processing to ustawienie właściwego numeru portu Serial.list()[x]. Na moim maku to jest numer 1. Dodatkowo dodałem linijkę text(portName, 10, 10, 70, 80);, która wyświetla nazwę portu, na którym środowiska komunikują się.

PROCESSING ⇒ARDUINO

Kod dla Arduino:

 char val; // Data received from the serial port
 int ledPin = 13; // Set the pin to digital I/O 13
 
 void setup() {
   pinMode(ledPin, OUTPUT); // Set pin as OUTPUT
   Serial.begin(9600); // Start serial communication at 9600 bps
 }


 void loop() {
   if (Serial.available()) 
   { // If data is available to read,
     val = Serial.read(); // read it and store it in val
   }
   if (val == '1') 
   { // If 1 was received
     digitalWrite(ledPin, HIGH); // turn the LED on
   } else {
     digitalWrite(ledPin, LOW); // otherwise turn it off
   }
   delay(10); // Wait 10 milliseconds for next reading
}

kod dla Processing:

import processing.serial.*;

Serial myPort;  // Create object from Serial class

void setup() 
{
  size(200,200); //make our canvas 200 x 200 pixels big
  String portName = Serial.list()[1]; //change the 0 to a 1 or 2 etc. to match your port
  myPort = new Serial(this, portName, 9600);
}
void draw() {
  if (mousePressed == true) 
  {                           //if we clicked in the window
   myPort.write('1');         //send a 1
   println("1");   
  } else 
  {                           //otherwise
  myPort.write('0');          //send a 0
  }   
}

PROCESSING ⇔ARDUINO

Kod dla Arduino:

char val; // Data received from the serial port
int ledPin = 13; // Set the pin to digital I/O 13
boolean ledState = LOW; //to toggle our LED

void setup() 
{
  pinMode(ledPin, OUTPUT); // Set pin as OUTPUT
  //initialize serial communications at a 9600 baud rate
  Serial.begin(9600);
  establishContact();  // send a byte to establish contact until receiver responds 
}

void loop()
{
  if (Serial.available() > 0) { // If data is available to read,
    val = Serial.read(); // read it and store it in val

    if(val == '1') //if we get a 1
    {
       ledState = !ledState; //flip the ledState
       digitalWrite(ledPin, ledState); 
    }
    delay(100);
  } 
    else {
    Serial.println("Hello, world!"); //send back a hello world
    delay(50);
    }
}

void establishContact() {
  while (Serial.available() <= 0) {
  Serial.println("A");   // send a capital A
  delay(300);
  }
}

Kod dla Processing:

import processing.serial.*; //import the Serial library
 Serial myPort;  //the Serial port object
 String val;
// since we're doing serial handshaking, 
// we need to check if we've heard from the microcontroller
boolean firstContact = false;

void setup() {
  size(200, 200); //make our canvas 200 x 200 pixels big
  //  initialize your serial port and set the baud rate to 9600
  myPort = new Serial(this, Serial.list()[1], 9600);
  myPort.bufferUntil('\n'); 
}


void draw() {
  //we can leave the draw method empty, 
  //because all our programming happens in the serialEvent (see below)
}

void serialEvent( Serial myPort) {
//put the incoming data into a String - 
//the '\n' is our end delimiter indicating the end of a complete packet
val = myPort.readStringUntil('\n');
//make sure our data isn't empty before continuing
if (val != null) {
  //trim whitespace and formatting characters (like carriage return)
  val = trim(val);
  println(val);

  //look for our 'A' string to start the handshake
  //if it's there, clear the buffer, and send a request for data
  if (firstContact == false) {
    if (val.equals("A")) {
      myPort.clear();
      firstContact = true;
      myPort.write("A");
      println("contact");
    }
  }
  else { //if we've already established contact, keep getting and parsing data
    println(val);

    if (mousePressed == true) 
    {                           //if we clicked in the window
      myPort.write('1');        //send a 1
      println("1");
    }

    // when you've parsed the data you have, ask for more:
    myPort.write("A");
    }
  }
}